JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrap">
    <input type="text" id="inputbox" name="input" placeholder="yes" />
</div>
<div id="counter"></div>

CSS

input {
    margin-left:3em;
    min-width:100px;
    max-width:600px;
}

JavaScript

$(function(){
    $('#inputbox').keyup(function(){
        $(this).width( $('#inputbox').width() + 5 );
    });
});